Process of assaying.



UNITED STATES PATENT OFFICE.

JOSEPH C. HAMES, OF GQLDFIELD, NEVADA.

success or ASSAYIHG.

Specification. of Letters Patent.

-Patented Feb; 23. 1909.

Application mm September 10,1902. Serial in, mass.

To all whom it may concern:

Be it known that I, JosEPH C. Hnms, a citizen of the United States, residing at Goldfield, in the county of Esmeralda. and State of Nevada, have invented-new and useful Improvements in Processes of Assaying, of which the following is a specification.

My present invention pertains to assaying, and consists in a'n expeditious and otherwise advantageous process of assaying.

In assaying for gold I take a definite quantit say one-half assay ton, of pulp, and ad to the same 17 partsofa composition consisting oh be following ingredients, como bined insubstantially the proportions stated, v12:

Gum camphor 1 part. Iodin crystals 20. 736 parts. Potassium iodid 41.471 parts. Water 310 parts.

I find from experiments that the best results are obtained by adding to the pulp .3.

otassmm' iodid in a dry state, and 14 parts of water,-

parts of the camphor, iodin and in the order named, and then suitably stirrin or agitating the mass. w

o the solution from the assay described in thefore oing I add dram of sodium amalgam, this latter to recipitate gold,

. after which the metallic go (1 may be recovered in any of the well known we 5 extant.

In assaying for silver I ractice t a recess described up to and inc Liding the a. dition of the urn camphor iodin crystals and potassiun iodid and thia water to the pulp. I

P L'The then add to the whole sodium c anid con-e spending in quantity to the pn p. Then I take the solution from said assay, and precipitate the silver on zinc shavings'or with zinc dust. shavi C or zinc 'dust is 'dissolved in nitric acid er which water and about 200 milligrams of sodium hyposuliate are added to the acid. This produces a clear solution to which is added one drop of a mixture com prising 2 ounces of water-and 40 drops of the-solution from the gold assa the said With this done, the mass of zinc drop serving to indicate in the so ution from the silver assay a certain amount oi. silver.

Having described my invention, what I claim and desire to secure-by Letters-Pat cut, is:

JOSEPH C. HAMES. Witnesses:

E. F. Harms, R. J. Pianos.

process of assaying for PIECIOUS' the- 

